A frog in sewing is a sort of closure, often used in cloaks, made from a specially knotted cord forming a button of sorts, and a loop on the other side of the closure, forming an effective button hole.
FROG stands for Frequency-Resolved Optical Gating, a method used to measure ultrashort optical pulses.
A frog, in railways, is the means of passing one running rail through another, with flangeway; most commonly found in switches but also diamond crossings and the ends of gauntlet track.
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Frogs range in size from less than 50mm (2.0 in) to 300mm (11.8 in) in Conraua goliath, the Goliath frog from Cameroon, which is the largest known frog.
Frog noise tends to be spelt (for English speakers) as "crrrrk" in Britain and "ribbit" in the USA.
The female frog lays her eggs in a shallow pond or creek, where they will be sheltered from the current and from predators.
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